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[aprssig] Preliminary delayed packet analysis

Stan - N0YXV n0yxv at gihams.org
Fri Jun 16 17:59:25 UTC 2006


Quoting VE7GDH <ve7gdh at rac.ca>:

> Stan N0YXV wrote...
>
> > I guess what I'm trying to say is that when you look at online
> > sites like Findu.com you see the one packet that made it to the
> > APRS-IS system without all the dupes...
>
> You must be looking at www.findu.com/cgi-bin/find.cgi?call=N0YXV-9.  Try
> clicking on "raw APRS data" over on the left...
> www.findu.com/cgi-bin/raw.cgi?call=N0YXV-9 or better yet,
> www.findu.com/cgi-bin/raw.cgi?call=N0YXV-9&time=1

I am looking at the raw data. Several of those packets you listed in the link
above hit at least 4 IGates that I know of yet only one shows up.

Take this packet as an example;
20060615235317,N0YXV-9>GPSMV,WIDE1-1,WIDE2-1,qAR,N0YXV-1:$GPRMC,000157,V,3900.0000,N,09500.0000,W,000.0,000.0,010105,003.8,E*78

(Ya I know long GPS strings are ugly....got to get back to finishing my HamHUD
:-) )

That exact same packet should have hit WY0F, KC0MWM, K0BEV, and on the Digi side
it should have hit WY0F-15, HSTG, NU0C-1, NU0C-15, KA0DOC and possibly KA0DIZ-1,
KC0EQA-11, NX0R-9 but yet none of those call signs show up. That's because the
APRS-IS caught all the other dubs (good thing) and ignored them.

Packets don't just go one direction and stop. They keep going in a 360 degre
pattern from where they started until they time out at WIDE3* (or whatever your
using). Put the APRS-IS only shows one path to the IGate that got to the APRS-IS
first.

Side Note: Just in case you wanted to know my RELAY setting in the log was an
experiement to see what happened if you send old settings every 30 minutes while
the reset of the time sending correct packets. Experiements over...now to find
that darned 9Pin to 25Pin serial cable.....hum lets see now where did I put that
darned thing anyway?

>
> Also.... www.db0anf.de/hamweb/aprsdb/showdata/N0YXV-9/shdigiusage

This link showed me the same thing the link above did.

>
>  > I'm just wondering out loud if there could be some online place where a
> > person could go to see just exactly how many IGates have seen packet X. I
> > think it might just open the eyes of some of the people that still think
> > WIDE5-5 is a good idea.
>
> Hey, there's always RELAY,WIDE5-5,RELAY,WIDE5-5,TRACE7-7,RELAY
> if you really want to get some DX !
>
> 73 es cul - Keith VE7GDH
> --
> "I may be lost, but I know exactly where I am!"
>
>
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